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DLPC900: Intermittent image artifact, black bar

Joe Moore
Prodigy 10 points
Part Number: DLPC900

We are using the DLP6500EVM board using the DLPC900 controller to project an image in video pattern mode via the display port input. We have noticed an intermittent fault where a 'stripe' of DMD mirrors do not turn on. I have attached a photograph of the DMD which should be presenting a pure white field. Unfortunately I do not have a suitable image to precisely determine the width of this stripe. This issue cleared when the board was reset.

Do you have any advice on what may be causing this artifact, and how we can prevent it in the future?

Thanks in advance,

Joe

  • 0
    TI__Expert 3040 points

    Hi Joe,

    Can you please share the Firmware version used. Sharing GUI screen capture will help.

    Do you see any error flag set on the GUI. "Forced Swap" or "Sequence aboard" any other error when the problem happens.

    Please share GUI screen capture of Pattern mode page. Exposure/Dark time value, Is "Frame change" trigger enabled ?

    What is the video input frame rate. 

    By any chance does this happens with Prestored/Pattern on fly modes? 

    We have similar post. Please follow the suggestion provided and check if issue is still observed.
    https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/1079445/dlplcr50xevm-pattern-output/4003074#4003074

    Thanks,
    Shivakumar

  • 0 in reply to SHIVAKUMAR R
    Prodigy 10 points

    Hi Shivakumar,

    Thanks for the message. We are currently using FW 6.0.0.

    As for your other questions we are setting up the pattern via a C# application using the Lightcrafter SDK. The pattern is defined by:

    AddToPatLut(0,   // Pattern number
    16200,           // Exposure in us
    false,           // Clear pattern flag
    8,               // Bit depth
    1,               // LED select
    true,            // Wait for trigger
    0,               // Dark time
    false,           // Trigger output 2
    0,               // Splash index
    0)               // Bit index

    I think the video frame rate is 60 Hz. Unfortunately I don't know the state of the frame change trigger. Do you know how I can access this value in the SDK?

    Thanks,

    Joe



  • 0 in reply to Joe Moore
    TI__Expert 3040 points

    Hi Joe,

    Thanks for sharing the information.

    "frame change" trigger input in GUI and "// Wait for trigger" field in AddToPatLut() looks same.

    Can you please do the moving to video pattern mode, Update LUT operations using GUI and check if you can still reproduce the problem.
    Enable Batch file command logging to record commands sent by the GUI. 

    Notice if any errors are set in the GUI status when issue is observed on the DMD.

    Thanks,
    Shivakumar

  • 0 in reply to SHIVAKUMAR R
    Prodigy 10 points

    Hi Shivakumar,

    As the problem here is intermittent, I can't reproduce it through the GUI. However, I will check these values if it occurs again and open another thread with more information.

    Thanks again for your help,

    Joe